Study on sulfur resistance of MnO_(2)/Beta zeolite in toluene catalytic combustion: The effect of increased acidity on catalytic performance  

作　　者：Zhuo Wang Zetao Jin Hanqi Ning Baishun Jiang Kaiyuan Xie Shufeng Zuo Qiuyan Wang 

机构地区：[1]Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process,College of Chemistry and Chemical Engineering,Shaoxing University,Shaoxing 312000,China [2]College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China [3]State Key Laboratory of Elemento-Organic Chemistry,Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),College of Chemistry,Nankai University,Tianjin 300071,China

出　　处：《Chinese Journal of Chemical Engineering》2025年第2期187-195,共9页中国化学工程学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(21577094);the Zhejiang Public Welfare Technology Research Project(LGG19B070003).

摘　　要：Sulfur dioxide(SO_(2))frequently coexist with volatile organic compounds(VOCs)in exhaust gas.The competitive adsorption of SO_(2) and VOCs can adversely affect the efficiency of catalytic combustion,leading to catalyst poisoning and irreversible loss of activity.To investigate the impact of sulfur poisoning on the catalysts,we prepared the MnO_(2)/Beta zeolite,and a corresponding series of sulfur-poisoned catalysts through in-situ thermal decomposition of(NH_(4))_(2)SO_(4).The decrease in toluene catalytic activity of poisoned MnO_(2)/Beta zeolite primarily results from the conversion of the active species MnO_(2) to MnSO_(4).However,the crystal structure and the porous structure of MnO_(2)/Beta zeolite were stable,and original structure was still maintained when 1.6%(mass)sulfur species were introduced.Furthermore,the extra-framework Al of Beta zeolite could capture sulfur species to generate Al2(SO_(4))_(3),thereby reducing sulfur species from reacting with Mn^(4+) active sites.The combination of sulfur and Beta zeolite was found to directly produce new strong-acid sites,thus effectively compensating for the effect of reduced Mn4+active species on the catalytic activity.

关 键 词：Sulfur-resistant mechanism VOCs catalytic oxidation Beta zeolite In-situ thermal decomposition (NH_(4))_(2)SO_(4) 

分 类 号：O643.36[理学—物理化学]